4. Background
Sustainable Rivers Audit (SRA)
• Establish 1750 Reference Condition
• Assess five themes against reference condition
1. Fish
2. Macro Invertebrates
3. Hydrology
4. Physical Form (of River Channels)
5. Vegetation
• Ongoing monitoring of themes against land-use, water–use
vegetation cover, Climate
5. Methods
• Metrics = Observed/Expected
• Expected = Reference Condition value
Integration:
• to indicators, Theme Indices, Ecosystem health
• using Expert Rules
Current Data Reference Data
Metrics
6. Aggregation: from Site to Basin
• Zones for stratifying
sampling effort
• Samples at random sites or
census of reaches within
Zones
• Aggregation from
– Site to Zone; and
– Zone to Valley.
7. Full Wave Form LiDAR
• Entire backscattered signal
recorded
• Acquisition of a continuous
section
• Additional information on the
illuminated surface structure
(Chauve, 2007)
8. Data collection for new Themes
Derived layers and data include:
• 1 m surfaces
• 25 cm contour lines
• Vegetation height surfaces
• Bank and channel delineation
• Channel wetted area polygons
• Bank geometry and vegetation height
measurements
• Summarised to valley/zone reporting of
River Health (observed vs expected)
9. Project Scope
SITES
23 Valleys across 1M sq. km
X 70 sites per Valley = 1610 river sites
+ 31 control sites near airfields
+ 71 check sites
= Total 1710 surveyed sites
Primary DATA SETS
27 x base data sets for each site
Measurements
50 x Physical Form Channel
Measurements for each of 19 transects
per site.
17 x Vegetation Measurements per bank
area per vegetation polygon.
TOTAL
Over 2,000,000 measurements
Over: 200,000 files
17. 1. Map Channel Features
2. Generate 19 x transect profiles
3. Measure 50 x Channel attributes for each site / transect
Channel Width
Le
ft
B
an Channel Depth
e
k
gl
Convexity Left B. Le
An
ng x-sectional area
k
t
an
h
B
Left Bank Inflexions
ht
g
Ri
Bed width
